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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26f01bb5a73176cda34f03f0632e4bd3896207802eaaf4d769f6ea1ab7641f4' 
  AND token = 'TM3mI1kBH25pmswzFq0VkiIptExAcGazSU4VHsGaNWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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