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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '229f6b5404c4e7c95a27e4f3d862a6b0b7826df0337e82e3bafad700d47f29f9' 
  AND token = 'MGMRsfE9ZqCuuvkS/CgjnxDnw1X70npIF7xya1Wu/wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}