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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6a183df91f69c490de3cf6429ea6cf1e61c522421577a4e70cc12f4b278b29' 
  AND token = 'ti4lYX0eWn+zzxMvXu17oAkHffJkV4ozegyC/0omsYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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