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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '626511d0dc38777551e8d1c881da688853b00baa0283245b01bd8cc63c534970' 
  AND token = '4koQU0kh8fyH5C3PsfHTht1CQp6HY9z4XNikg1Qu1AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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