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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c68a4cacd25520c24ce4ee749198284999bc53f616ff21e4449718f5f7ec80' 
  AND token = 'HboPNBosjgPV7g7T0twHc/ge2oaMVRrDYDEIBQmUfAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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