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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42447bd3b4036412b4a6e81471cb39bb6630cb34043145172885359739d0942' 
  AND token = '+zvsCMq1G/E7JzkrpvPj119MoxkOnvjwCCvvdUBaZl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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