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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '144972f03e914fab82601c374c5abf951951e1a239ae2a02240ed4342e16b602' 
  AND token = 'UNS4JGb7jehqvnO24WrAZuvERVx1SEGIxMTEGp+NsOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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