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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94940625f9d234d2a2b5bf291832e4567d33db6700f425793a0ed85a813af4e8' 
  AND token = 'nCTur427OcSx+qVEaUanHYOL7AYb954QRQ4AVgsNZII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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