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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb153ecf329ee580b5d5343b63aa7c95a0a86703393c1408151784f6f33c771' 
  AND token = 'Wlt9LCt0AFsVyMLPw59wPDYBNwNRaPCO0jQaybrCpNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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