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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c44050b670479f5cb3645e10f43de0a85368577e307bbc26cfa5d4bf5e71cd' 
  AND token = 'E4uGDoxjgQUjLk9E6niYFBXOwEYcClGZQxV00GQHDIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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