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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad28c7fdfef01b224038b851c8049bc27327e53756fbd90a882196366b0b805' 
  AND token = 'TyzasUwZoprC76YXsDDE9aAR53TLsJQ9//rsA5yphNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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