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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e352a174d167f4ba7e01b75a3780df62cc25c6f602a0ab2724645b7df0e0f9f' 
  AND token = 'ryNY1nJxX2eNgHw5e59gSN+BdgXJuHDIVrEavguDd/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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