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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '243fbe7aa20cc62e90e9e3cff18e90671d83b8b3b1325e8a0fe1f724fc240b91' 
  AND token = '+56kZWlDzWnaNkkn3frODy/1zuNqnjWztPHiiiHSQzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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