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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83001307ef88d0ae172d6b30b4a6d3e6b4d72c95bbc69c0a891ff14bad2d8109' 
  AND token = 'kPX7ToIQt3D7XQmV/WMv2Y008Az0HeufXuzYIxOySig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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