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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd305518b38b3a86df9942eeda899758ff97f23411d984ea703fb97251755b9a' 
  AND token = '/YR3/RNW7l/sEe4sWi2WbOPVQ0Mi4zCRHZn7006fAyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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