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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '990fbcba8dc0334f2d9e9cd3a83ee5092da805338fb0972e1039887758e70786' 
  AND token = 'OIcb7xKkk6r5loZU6frbprZkEiOulEpGActU2ZInMCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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