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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72051cc8830a82b7567f99e52319b4e30dfe97a6f6b67db767b5017a09a1532d' 
  AND token = 'gMyD7ZipgiGZmcjra72Lc38V3ycFFjppKrrsXmjB1Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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