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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c19f5cb5cbf173070ca3d6d4187ffc00ffada91e311c8d5a91b5f8449e7992c' 
  AND token = 'qZj/KGANEiw4G/obwdA9MYkGEVKeQpld5/Ug8j5H7UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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