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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e70291fc7ad09a7fb23bd81b482dfb0dfb2cae72853e153c2865e4ea85be3a0' 
  AND token = 'qQUzWFpdkrOh5AmwheygxI9Zle8Dro1x/VUGBnajluc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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