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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90fcc8e6d58417003b40f4e4383053e0f8bc39ef659aed726f9df857a175213' 
  AND token = '60/0emu2XNxfCdksKuHHEZ46pQZHsTTbSYaw9ctMK2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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