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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac2f70810a47eca1f42579add7060a03afce910c809eb022467273e23e3e4a3' 
  AND token = 'SQpQnr14uXQ/cqqiLKDHFj4/1ebTVTC7BC/VOcoPX3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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