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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d80ed58088526c1efcb15c6046ea0c352664bcef11ff736008ed7078f97125' 
  AND token = 'DNg9bJiMeepC0C3X0ZF0cEKpJi22ws12/fwFG2g2RuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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