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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f004c06c679946b179b186d0bd15d4d2484782956db51505773ed850c652bca0' 
  AND token = 'Kny1uKiARxSRT4fPC/sTCzYkMo9lHSlZWGu7KR6YRPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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