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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08a62913fc23867e6b3b12d6ee18b9c7f34e602e79fc5c6f6b45fd726421405b' 
  AND token = 'Z6xscB50t/pfRNH8z0wLaA0512h82cSfSY4f+pGHP/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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