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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf23b6cb1b0bf1069e2e310b330fda1fb2379a827c7e7f5e0e1a9e10f84ab888' 
  AND token = '9Fkm8kacnqrDdLVR17/THo01iCOiukFQOt1QViQ/iAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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