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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e672588fc3e3bb7cfa0048a44571e4d13e540ddbf9ad19d8c6785cb04f9763e7' 
  AND token = 'X5bLHp6T4MK7v74RojPBxgpgugvw4bgvLFPiSZtfUA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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