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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1edacc6305afe7edc82e09eafb89c955a8c7125ad1c0d79de908c9d4a6be7fc1' 
  AND token = '9JzgO9ALQO/gHtL1urcQY7z3kqDhn1S1Xn9w269jzdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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