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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '743fe7981c8ad6128b78d2bb6cb5bc816df1c39f61ebcbea19553c057032c2c4' 
  AND token = '9b3ceMSG6YG2vOheO5WrkXjkFuXOm9ba/2M2VT3tgRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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