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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba44e25d21d0e728beb1d8582e8da544f2f4ddf18294db175a5c3224446ac99b' 
  AND token = 'ewgNHx7qs1dQ+C5LddjTlnN1/UOZrHB4Nou2Cnr/d/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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