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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a497d30bf9399ee1c9e52367687e84ea36e647ab8dc300e9291ca4b30df40833' 
  AND token = 'ASd5NAjWSnyjN3QEhuxmhs/km+vHANxiWAC3CUunYD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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