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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '575475b38ceecef89cde69c1417e90fc123cbc46572ad455bb932427f7eb9140' 
  AND token = 'MwZN/FYeBCGivBfHMU84WoS63HSr82G2XNAu5lEwRJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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