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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd1559017c6b706c05d7ce22af9a8a7111f74380991538e45f3c0b3c94a9881' 
  AND token = 'SurJij8u5ZnPm4iCLW7R3StStL0LxNuqXjhDdiiBPVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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