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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e21558093e1731baadc4fd6147dc9e4b3e109d501c23421d03c96c9befb34d' 
  AND token = 'xV2tYDrEcvNJCwyDFjov0uJv3lvdz+Fu0U7c6EMckOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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