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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807d178fc2a4cced1e299b4885ea55854d7a6a69e131c4b45bec4f2ec60b6f4a' 
  AND token = '2knVBV2R1sAAmKsZ2AFL8eK4ACgX6k+miVrX9FJuvNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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