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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e974bfc6db20e7a9019ae2e2c923e80eab554a59e55fa69136ca6aa8e94da9' 
  AND token = '+0gAVRc8B44diWJc2xseSqab3SEFn1gYz5gfaW3exyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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