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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7d9c2d989f42ef186736944e3677db74767216875637909bcf7f6fc5b24b6d' 
  AND token = 'w+rEZ8Mc/W9WZGDffSd3i14+MDstMxBVJp13iCA25UA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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