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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a9de40ba19b7d32aa51e51bb787a3243fa82844b7d0c05d95e3b1803b2dc9c' 
  AND token = 'ih5J5kgqXUPn+9MNvVA5g3oIt3S9ti/3sV2MFmZ6OmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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