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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90306ac29a19ca562976d0de548dcf887c69192b35339e23455c3583976fbc1e' 
  AND token = '8AU8AiNv97Iwtg3XW5nCk98ocZy2/Lhe5jkeZl6aSEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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