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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9362d50d97fcbb1916e583d0b233f8b1c630cf6e381c37eb4d5d18cc199c226e' 
  AND token = 'l3Gzl4S3Slw05yLlu5DKNaqyFPaqzIT2dhBHGawbBjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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