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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01fbb55edcd9a323d98f1d014d5012168660313041b36369675de086ccd469dd' 
  AND token = '6FVmSPJ+K2iEzZYp16Jd60GZn/Asm5YU9BTulOZP200=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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