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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6363cde89b2d98961876b6d5fb81daefbf7bde1d09a568ee7cf4ebed8f34186e' 
  AND token = 'L7Xx9CDIVIjc8+Vs11/+X+18x7K93VtmHwVKjizMVgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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