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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5772737ee19d578942365fb9958954b414cad25eac4109a9404f6b95f8826d63' 
  AND token = 'tgn8GywW/6belMQL1O5jY7l17l75vj4vbCgc3MtChlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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