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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6e65c4206058bfd5878ea15a74a30c72c562910395c469a52359633dddf7a3' 
  AND token = 'VTF0kW9kTn1mH9G14KqnqZtUcQtaUD06RS0d+g+Dz54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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