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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '758249e14808bbc81cc8f8fe69bbc6512f5e4a44d203a7cfdf5954aa93ca7b31' 
  AND token = 'r9RveT07sBDFbtnm1KMDIIZsFyP6XqkKEQb4WOCl2Wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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