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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e631d163d85825db9a6080e615495da6706cc874f3df6800547019fbcfa5b617' 
  AND token = 'A/CqEavQBijUifybFzYj98pBwaoa7jyRtd77B87T5tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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