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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f236fe7527116323c3f3d363743fb7cdd1f3f8e95e2e623c179f7fe5622f6b0' 
  AND token = '2BhrLDxuJ/7lT+rIT99mjaa6FW1+cTA+Ff5odIIxq08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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