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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ae119ddb769c7ed4c6e7d8ad67ad03f1dbef2e7ed0a45d347bb696095c8c87' 
  AND token = 'N4oqYmCHJj1DWcqbTp2uGvR12cmoshNlPIwfwGnxkfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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