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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d67c9736ed9e15a9ffaf99356707b7d5ebe449f8efee93fe1283ba8d924ec01' 
  AND token = 'lmbMdG6m1Zak1Bp/WKP5sNbDfO4WSwT64hcxgzRVC3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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