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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '138c755f267f9c9d3761b0940f86e9cbbca9272fdfd3887cf65524cf97db5fac' 
  AND token = '72MrZMeRaGFP4Qkwp3gZcJaFCNj3QuXfXCZmK6vT118=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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