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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d6eb7901ad909296f238c0f9ba8ace81800957d48309928cd6a4e7c5bf387a' 
  AND token = 'C6wVs1A8kIegZY9J2nKMZtBUsy/6W3VUjP61sAYVomk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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