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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '152d8f28d8ce89ef7670cbb7784a7ba206b4d87d5a85f05484cc67a6edd36516' 
  AND token = 'RgunVFm3paKk/cu81RDA+lXB+bZpaDacRJaqQbsPQ+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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