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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c14f27a269b9f7c7970e74c18b0901a13879d7c5556164e31e4363c4464500' 
  AND token = 'MHnNZeDb6eDbD5LIaQbHZl8z6w5cy2tbXUSz4ixspoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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