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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68da932a1d0c0eac44546b130d8afaa830651e16c1b40b606aaf111e62c9d91c' 
  AND token = 'iFN2TwKb4+BVO1bHTJwbQ5qtA9S/0Ms+PbVfKS9iSEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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