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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a88a2264e90570232eb8581321dd4e7a270de606533603d5e3bb68d5a17c65' 
  AND token = 'idSQgVZ3FUdWwDpjsA4CijwQc4mlJCJtZprEjnqPY3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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