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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c804c8c2b887503dc33045d255207060d23e703506e207aa7d20bde4f17cf5' 
  AND token = 'z6t9LgKVRL2oh3oFtNDiwK4HgpoPp5LTvy/C51U+lTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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