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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9a5c6cdeb18ed3ff9723e3aacd4df8daacee3a417e58c7b4182649cdd8dbfb' 
  AND token = 'MupS+sEOQLXXj+spkM/8uIRgh5oj8amsIaV4ULF2bZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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