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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d268eb49b70f491413e41085debc2e9dd87481b491a760609406b2509c9ff76' 
  AND token = '/Xs68xE2j7wP4XcDoyCwbdhNe3JEaSfUBpCKnD4Nh+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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